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Heat shock protein 72 enhances manganese superoxide dismutase activity during myocardial ischemia-reperfusion injury, associated with mitochondrial protection and apoptosis reduction.

AbstractBACKGROUND:
Heat shock protein 72 (HSP72) is known to provide myocardial protection against ischemia-reperfusion injury by its chaperoning function. Target molecules of this effect are presumed to include not only structural proteins but also other self-preservation proteins. The details, however, remain unknown. Manganese superoxide dismutase (Mn-SOD) is an enzyme that preserves mitochondria, a key organelle for cellular respiration, from reperfusion injury and limits mitochondria-related apoptosis. We hypothesized that Mn-SOD would play a role in HSP72-mediated cardioprotection.
METHODS AND RESULTS:
Rat hearts were transfected with human HSP72 by intra-coronary infusion of Hemagglutinating Virus of Japan-liposome, resulting in global myocardial overexpression of HSP72. After ischemia-reperfusion injury, cardiac function (left ventricular systolic pressure, maximum dP/dt, minimum dP/dt, and coronary flow) was improved in the HSP72-transfected hearts compared with control-transfected ones, corresponding with less leakage of creatine kinase and mitochondrial aspartate aminotransferase. Postischemic Mn-SOD content and activity in the HSP72-transfected hearts were enhanced in comparison with the controls (content: 96.9+/-4.1 versus 85.5+/-2.5% to the preischemic level, P=0.038; activity: 93.9+/-2.2 versus 82.2+/-3.7%, P=0.022), associated with improved mitochondrial respiratory function (postischemic percent respiratory control index; NAD(+)-linked: 81.3+/-3.8 versus 18.5+/-4.4%; FAD-linked: 71.8+/-5.5 versus 20.7+/-5.3%, P<0.001). In addition, incidence of postischemic cardiomyocyte apoptosis was attenuated in the HSP72-transfected hearts (4.0+/-1.1 versus 10.3+/-3.3%, P=0.036), correlating with an increased Bcl-2 level and reduced up-regulation of caspase-3.
CONCLUSIONS:
These data suggest that the enhanced Mn-SOD activity during ischemia-reperfusion injury, which is associated with mitochondrial protection and apoptosis reduction, is a possible mechanism of HSP72-induced cardioprotection.
AuthorsKen Suzuki, Bari Murtuza, Ivan A Sammut, Najma Latif, Jay Jayakumar, Ryszard T Smolenski, Yasufumi Kaneda, Yoshiki Sawa, Hikaru Matsuda, Magdi H Yacoub
JournalCirculation (Circulation) Vol. 106 Issue 12 Suppl 1 Pg. I270-6 (Sep 24 2002) ISSN: 1524-4539 [Electronic] United States
PMID12354745 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Cardiotonic Agents
  • HSP72 Heat-Shock Proteins
  • Heat-Shock Proteins
  • Superoxide Dismutase
Topics
  • Animals
  • Apoptosis
  • Cardiotonic Agents
  • Enzyme Activation
  • HSP72 Heat-Shock Proteins
  • Heart (physiopathology)
  • Heat-Shock Proteins (genetics, physiology)
  • Mitochondria (physiology)
  • Myocardial Reperfusion Injury (enzymology, pathology, physiopathology)
  • Myocardium (enzymology, metabolism, pathology)
  • Rats
  • Rats, Inbred Lew
  • Superoxide Dismutase (metabolism)
  • Transfection

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